Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 900mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke900 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S
The AirTAC SAIJ125X900-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window between 870 and 900 mm. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for moving heavy actuators or large format tooling. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant includes a magnet for use with CMSE reed and DMSE electronic switches.
Equipped with a 32 mm carbon steel rod and M27x2 threads, this model handles substantial loads, though the 900 mm length means an external guide is strongly recommended to prevent side-load damage. The rear adjuster acts purely as a mechanical stop to set the retract end position during commissioning or product changeover, without requiring a cylinder swap.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 900 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×900 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S Is Used
Variable Position Tooling
Fine-tune the 870-900 mm travel window during machine setup to accommodate different workpiece lengths without changing out the entire cylinder assembly.
Product Changeover Stops
Quickly adjust the retract end-stop position on a packaging line when switching between different carton or product sizes on the fly.
Heavy Material Ejection
Leverage the 6136 N push force at 0.5 MPa to reliably push heavy components or pallets out of a machining cell, stopping short of the full 900 mm when needed.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S the Right Cylinder?
Choose this 125 mm bore when 80 mm (2513 N at 0.5 MPa) is insufficient but the 160 mm bore (10053 N) would be excessive overkill. The adjustable stroke is highly beneficial on long-throw machinery where you need to dial in the exact end-stop for varying product sizes without adding external stops.
For an exact ISO 15552 replacement match, verify the 900 mm stroke, 30 mm adjustment, PT tapered G1/2 port, and the -S magnet option. Because the stroke is 900 mm, an external guide rail is critical to support the load and prevent rod bending. Remember that the rear adjuster is a travel stop, not a lock; if you need to hold a load safely without live air pressure, use an external rod lock or pilot-operated check valve.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X900-30S FAQ
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the push force increases to 1251 kgf.
The rear mechanical stopper lets you trim the effective travel back by up to 30 mm, creating a usable stroke window from 870 to 900 mm. This allows precise end-position tuning at commissioning without swapping the cylinder.
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